Alot of people think that making a 8mm Mauser rifle accurate requires alot of money. Not true. The 8mm Mauser, as well as other factory Mausers, is one of the most accurate rifles ever produced during wartime or peacetime.
If a Mauser rifle does not shoot worth a hoot, its a good chance the barrel may be a bit worn, or, a bit bigger than you rounds you are shooting. Here is a handy tool to help you to slug an old, or new, rifle barrel.
Take a cast lead bullet. Something around .325. Tap it through your barrel with a mallet and dowel. Do not use a steel cleaning rod. Then take your calipers and measure the dia